n, m = map(int, input().split())
edge = [[] for i in range(n)]
for i in range(m):
    a, b = map(int, input().split())
    edge[a].append(b)
    edge[b].append(a)
used = [True] * n
for i in reversed(range(n)):
    flag = False
    for e in edge[i]:
        if not used[e]:
            flag = True
    if not flag:
        used[i] = False
ret = ''.join(["1" if used[i] else "0" for i in reversed(range(n))])
s = 0
while s < len(ret) and ret[s] == "0":
    s += 1
ret = ret[s:]
print("0" if ret == "" else ret)